Options for IFunctionCollection.getItems.
Optional
Only the function with this name. Case insensitive.
Only functions of this type: 'formula', 'macro' or 'autoRun'.
'formula'
'macro'
'autoRun'
Compared against IFunction.getContext, which is what search filters on too, so the two agree on what a type means.
search
Options for IFunctionCollection.getItems.